-10
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That word "equals" in there makes it an equation.
80 + 10 equals 90 so the missing value is zero, ie 80 + 10 = 90 - 0
then 4 plus 3 equals 28 and 3 plus 3 equals 18 and 7 plus 5 equals 84 .... its easy you just have to multiply the answer with the first number.. for example : 2 plus 3 equals 5 but when you multiply the answer with the first number (2) it becomes equals 10, and so on the others..
The answer is 2 : 8-2+3 = 6+3=9. 10 - 3 + __ = 9. 7 + __ = 9. ---> 9-7 = 2.
80 - 10 = 30 + 40Both sides of the sum now equal 70.